Reverse Engineer — For Kaladesh but pushed for Aether Revolt. It allowed you to copy an artifact and then that copy got sacrificed at end of turn,[9] in the same way Heat Shimmer from Lorwyn does for creatures.[10]

Showoff — By Mark Rosewater, for Lorwyn. It allowed you to choose to reveal a card. If the card was revealed (from your hand or your library), then it could be played for its showoff cost, which was often cheaper than its normal mana cost.[11]

Stopwatch — mechanic forces you to do certain actions in a set amount of time. Considered for Unstable.[12]

Unnamed — By Mark Rosewater, for Tempest. It allowed you to choose to start with the card in your opening hand. If you chose to do so, you had to begin with one card fewer.[14]

Unnamed — By Mark Rosewater, for Time Spiral. It allowed you to put cards into your deck that you might not normally be able to play. The idea was the card say that if it was in your deck, then you were allowed to have up to four copies of a card from the past in your deck —even if that card wasn't normally legal in Standard. Understanding that those cards might not be broken cards, Mark Rosewater found six subsets of past cards, one for each color and one artifact, that could work —blue's member of this cycle was a creature that had the creature type Wizard.[14]

Unnamed — For Amonkhet. It made use of -1/-1 counters to represent the ruthlessness of Bolas.[15]

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